1. Department of Biomedical Science, University of Illinois College of Medicine at Rockford, Rockford, IL, USA
2. Department of Materials Science and Bioengineering, University of Texas at Dallas, Dallas, TX, USA
3. Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
4. Department of Restorative Dentistry, College of Dentistry, University of Illinois, Chicago, IL, USA
5. Department of Orthopedics, Rush University Medical Center, Chicago, IL, USA